Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

EARTH SCIENCES (527 journals)                  1 2 3 | Last

Showing 1 - 200 of 371 Journals sorted by number of followers
Nature Geoscience     Full-text available via subscription   (Followers: 161)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 149)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 144)
Earth and Planetary Science Letters     Hybrid Journal   (Followers: 141)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 133)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Marine Policy     Hybrid Journal   (Followers: 60)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
Geochimica et Cosmochimica Acta     Hybrid Journal   (Followers: 54)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
Natural Hazards     Hybrid Journal   (Followers: 53)
Journal of Earth System Science     Open Access   (Followers: 52)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 44)
Hydrological Processes     Hybrid Journal   (Followers: 44)
Estuarine, Coastal and Shelf Science     Hybrid Journal   (Followers: 41)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Geophysical Journal International     Hybrid Journal   (Followers: 39)
Groundwater     Hybrid Journal   (Followers: 37)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Geomorphology     Hybrid Journal   (Followers: 33)
Chemical Geology     Hybrid Journal   (Followers: 31)
Marine Geology     Hybrid Journal   (Followers: 31)
Geology Today     Hybrid Journal   (Followers: 31)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Reviews of Modern Physics     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geology     Full-text available via subscription   (Followers: 30)
Coastal Management     Hybrid Journal   (Followers: 29)
Advances In Physics     Hybrid Journal   (Followers: 29)
GPS Solutions     Hybrid Journal   (Followers: 28)
Bulletin of the Seismological Society of America     Full-text available via subscription   (Followers: 26)
Landslides     Hybrid Journal   (Followers: 26)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Quaternary Science Reviews     Hybrid Journal   (Followers: 26)
Ground Water Monitoring & Remediation     Hybrid Journal   (Followers: 25)
Geoforum     Hybrid Journal   (Followers: 25)
Earth Surface Processes and Landforms     Hybrid Journal   (Followers: 25)
Environmental Geology     Hybrid Journal   (Followers: 25)
Tectonophysics     Hybrid Journal   (Followers: 24)
Geocarto International     Hybrid Journal   (Followers: 23)
Coral Reefs     Hybrid Journal   (Followers: 22)
Bulletin of Volcanology     Hybrid Journal   (Followers: 22)
Hydrogeology Journal     Hybrid Journal   (Followers: 21)
Hydrobiologia     Hybrid Journal   (Followers: 21)
Tellus A     Open Access   (Followers: 21)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Water Resources     Hybrid Journal   (Followers: 21)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Earthquake Spectra     Hybrid Journal   (Followers: 20)
Tellus B     Open Access   (Followers: 20)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Sedimentary Geology     Hybrid Journal   (Followers: 20)
Dynamics of Atmospheres and Oceans     Hybrid Journal   (Followers: 19)
Geophysics     Full-text available via subscription   (Followers: 19)
Quaternary Research     Full-text available via subscription   (Followers: 19)
Geological Journal     Hybrid Journal   (Followers: 19)
Global and Planetary Change     Hybrid Journal   (Followers: 18)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
African Journal of Aquatic Science     Hybrid Journal   (Followers: 17)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Geological Magazine     Hybrid Journal   (Followers: 16)
The Holocene     Hybrid Journal   (Followers: 16)
Atmosphere-Ocean     Full-text available via subscription   (Followers: 16)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Sedimentology     Hybrid Journal   (Followers: 15)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Applied Geochemistry     Hybrid Journal   (Followers: 14)
Quaternary International     Hybrid Journal   (Followers: 14)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Pramana     Open Access   (Followers: 13)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 13)
Electromagnetics     Hybrid Journal   (Followers: 13)
Ocean Modelling     Hybrid Journal   (Followers: 12)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
Frontiers of Earth Science     Hybrid Journal   (Followers: 12)
Continental Shelf Research     Hybrid Journal   (Followers: 12)
Computers and Geotechnics     Hybrid Journal   (Followers: 12)
Arctic, Antarctic, and Alpine Research     Open Access   (Followers: 12)
Pure and Applied Geophysics     Hybrid Journal   (Followers: 12)
CATENA     Hybrid Journal   (Followers: 11)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Applied Geophysics     Hybrid Journal   (Followers: 11)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Cretaceous Research     Hybrid Journal   (Followers: 10)
Earth Interactions     Open Access   (Followers: 10)
Australian Journal of Earth Sciences: An International Geoscience Journal of the Geological Society of Australia     Hybrid Journal   (Followers: 10)
Bulletin of Earthquake Engineering     Hybrid Journal   (Followers: 10)
Gondwana Research     Hybrid Journal   (Followers: 10)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Journal of Seismology     Hybrid Journal   (Followers: 9)
Physik in unserer Zeit     Hybrid Journal   (Followers: 9)
Lithos     Hybrid Journal   (Followers: 9)
Limnology     Hybrid Journal   (Followers: 9)
Acta Geophysica     Hybrid Journal   (Followers: 9)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Geotectonics     Hybrid Journal   (Followers: 9)
Facies     Hybrid Journal   (Followers: 9)
Comptes Rendus : Geoscience     Open Access   (Followers: 9)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards     Hybrid Journal   (Followers: 8)
Geophysical & Astrophysical Fluid Dynamics     Hybrid Journal   (Followers: 8)
Natural Resources Research     Hybrid Journal   (Followers: 8)
Geobiology     Hybrid Journal   (Followers: 8)
Quaternary Geochronology     Hybrid Journal   (Followers: 8)
Earthquake Engineering and Engineering Vibration     Hybrid Journal   (Followers: 8)
Geophysical Prospecting     Hybrid Journal   (Followers: 7)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Physics of the Solid State     Hybrid Journal   (Followers: 7)
Plasma Physics Reports     Hybrid Journal   (Followers: 7)
Precambrian Research     Hybrid Journal   (Followers: 7)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Petrology     Full-text available via subscription   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Geochemistry : Exploration, Environment, Analysis     Hybrid Journal   (Followers: 6)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Geo-Marine Letters     Hybrid Journal   (Followers: 6)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Applied Ocean Research     Hybrid Journal   (Followers: 6)
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 6)
Chinese Geographical Science     Hybrid Journal   (Followers: 6)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Resource Geology     Hybrid Journal   (Followers: 6)
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
Island Arc     Hybrid Journal   (Followers: 5)
Geofluids     Open Access   (Followers: 5)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 5)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Geochemistry     Hybrid Journal   (Followers: 5)
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Zeitschrift für Geomorphologie     Full-text available via subscription   (Followers: 5)
Terra Nova     Hybrid Journal   (Followers: 5)
Energy Exploration & Exploitation     Open Access   (Followers: 4)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Geostandards and Geoanalytical Research     Hybrid Journal   (Followers: 3)
Surveys in Geophysics     Hybrid Journal   (Followers: 3)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Russian Geology and Geophysics     Hybrid Journal   (Followers: 3)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
JETP Letters     Hybrid Journal   (Followers: 3)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Fundamental and Applied Limnology / Archiv für Hydrobiologie     Full-text available via subscription   (Followers: 3)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Geomagnetism and Aeronomy     Hybrid Journal   (Followers: 3)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Zeitschrift der Deutschen Gesellschaft für Geowissenschaften     Full-text available via subscription   (Followers: 3)
Stratigraphy and Geological Correlation     Full-text available via subscription   (Followers: 2)
Annales Henri Poincaré     Hybrid Journal   (Followers: 2)
Rocks & Minerals     Hybrid Journal   (Followers: 2)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Polar Record     Hybrid Journal   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
Helgoland Marine Research     Open Access   (Followers: 2)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Studia Geophysica et Geodaetica     Hybrid Journal   (Followers: 1)
The Leading Edge     Hybrid Journal   (Followers: 1)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Doklady Physics     Hybrid Journal   (Followers: 1)
Russian Physics Journal     Hybrid Journal   (Followers: 1)
Reports on Mathematical Physics     Full-text available via subscription   (Followers: 1)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Russian Journal of Pacific Geology     Hybrid Journal  
Russian Journal of Mathematical Physics     Full-text available via subscription  
Physics of Wave Phenomena     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Moscow University Geology Bulletin     Hybrid Journal  
Marine Georesources & Geotechnology     Hybrid Journal  
Journal of Mountain Science     Hybrid Journal  
Grassland Science     Hybrid Journal  
Erwerbs-Obstbau     Hybrid Journal  
Bulletin of the Lebedev Physics Institute     Hybrid Journal  

        1 2 3 | Last

Similar Journals
Journal Cover
Journal of Contemporary Physics (Armenian Academy of Sciences)
Journal Prestige (SJR): 0.229
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1934-9378 - ISSN (Online) 1068-3372
Published by Springer-Verlag Homepage  [2469 journals]
  • Electrode Material for Supercapacitors Based on Products of Solid Phase
           Pyrolysis of Metal-Phthalocyanines

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      Abstract: Ni@C nanocomposites in a graphite-like carbon matrix and cobalt nanoparticles in carbon nanotubes were obtained by solid-phase pyrolysis of nickel phthalocyanine (NiC32N8H16) and cobalt phthalocyanine (CoC32N8H16). The metal concentrations in the carbon matrix in both cases in Ni/C and Co/C are the same—12 wt %. The structure and morphology of the obtained samples were studied by high-resolution scanning and transmission electron microscopy as well as X-ray diffraction. The capacitive and resistive characteristics of the obtained Ni/C and Co/C compounds as an electrode material for supercapacitors (SC) have been investigated. The specific capacitances measured by cyclic voltammetry are 12 F/g and 8 F/g for Ni/C and Co/C samples, respectively. The synthesized compounds can become a promising electrode material for super capacitors with an electrolyte solution of H2SO4.
      PubDate: 2022-03-01
       
  • Fraunhofer Diffraction by a Slit into a Homogeneous Anisotropic Medium

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      Abstract: Fraunhofer diffraction of light by a slit on an opaque screen located between a vacuum and a homogeneous anisotropic medium in the absence and in the presence of absorption at different orientations of the optical axis of the medium relative to the slit is considered. The well-known formula for the diffraction in a vacuum is generalized, with the inclusion of the case of diffraction into a uniaxial anisotropic medium in the absence of absorption. A formula is obtained that makes it possible to determine the directions of the diffraction minima and maxima taking into account this absorption.
      PubDate: 2022-03-01
       
  • Thermodynamics of Physical Approximations to Non Deterministic Polynomial
           Complete Problems

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      Abstract: Non deterministic polynomial complete problems are playing an essential role in nowadays communications, security and many other fields. One of the well-known NP-complete problems is the Examination Timetabling problem. Given the information about the courses and the students that have taken some of those courses as well as the time slots for the exams of those courses the problem asks if there is a timetable such that no student has two exams simultaneously. We are modeling this NP-complete problem as a system of particles with one dimensional motion. After adding some interactions between the particles based on the problem we are simulating the motion and arriving to an equilibrium. We then use the equilibrium state to group the particles together where each cluster represents a time slot. To discuss the physics of this model we use the Replica method to find the free energy functional of this system. A hypothesis is formulated that all or at least most numerical solutions for NP-complete problems can be brought to this model with some configuration of interactions between the particles.
      PubDate: 2022-03-01
       
  • Registration of Brain Radio Signals and Their Bispectral Analysis

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      Abstract: Using the probe antenna of the applicator, radio frequency signals (RFS) of the human brain are recorded. A method for digital processing of recorded RFS in the LabVIEW environment using spectral and bispectral analysis is proposed. As a result of spectral analysis, it was revealed that the human brain emits RFR in the megaHertz range, and as evidenced by the results of bispectral analysis, some groups of spectral components of RFR of the brain exhibit an internal correlation. The results of these studies can be useful for identifying fast processes in the human brain, for understanding the nature of these processes, and, as a result, for the diagnosis and treatment of various human diseases associated with the brain.
      PubDate: 2022-03-01
       
  • Superconductor-Insulator Transition in Ultra-Thin Sb2Te3 Nanoplates

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      Abstract: The conductivity of single-crystal nanoplates of the Sb2Te3 topological insulator has been investigated. A sharp drop in resistance occurs in ultrathin Sb2Te3 nanoplates at a temperature of about 4 K, which is a manifestation of superconductivity. The results show that the presence of an optimal degree of disorder is a necessary condition for the onset of superconductivity. A superconductor-insulator transition, tunable by a magnetic field, is observed in these nanoplates. The temperature dependence of the magnetoresistance in fields below the critical value (B < BC) shows a successive transformation of a weak antilocalization anomaly into a superconducting transition. The value of the correlation length exponent ν = 0.75 ± 0.05 was obtained using the scaling theory.
      PubDate: 2022-03-01
       
  • Dynamics of Charged Complex Molecules in Aqueous Solution

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      Abstract: The results of theoretical modeling of the dynamics of a charged large molecule in an aqueous solution under the influence of gravity, vertical electric field, and drag force are presented. Computations were carried out for the DNA molecule. It is shown that one can smoothly control the speed of movement of a molecule by an electric field so that it is possible to carry out accurate sequencing by the tunneling current method. It was also shown that the speed of movement of a molecule can be reduced to some decimal cm/s, which is equivalent to sequencing 105–106 nucleoids per second.
      PubDate: 2022-03-01
       
  • Gas- and Biosensors Made from Metal Oxides Doped with Carbon Nanotubes

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      Abstract: Single wall version of carbon nanotubes (SWCNTs) is promising for the detection of many important gases including gases exhaled by the organism. Properties of such CNT-noble metal sensors, detectors of gases exhaled by the organism, biosensors and other applications of CNT sensors in medicine are reported. Very promising is the realization of gas sensors based on metal oxides (especially SnO2) doped with CNTs. VOC sensors based on ruthenate multi-walled carbon nanotubes coated with tin-dioxide nanoparticles (MWCNTs/SnO2) nanocomposite structures were prepared and investigated in Yerevan State University (YSU) using three methods. The optimal conditions, operating temperature and the mass ratio of the components are established for the manufacturing of acetone and toluene as well as ethanol and methanol vapors detectors. The results of research works related to the study of MWCNT-SnO2 nanocomposite sensors of propylene glycol (PG), dimethylformamide (DMF) and formaldehyde (FA) vapors are also presented in this paper. The dependence of the sensor response on gas concentration is linear.
      PubDate: 2022-03-01
       
  • Methodological Research to Improve the Extraction of Near-Threshold
           Quasi-Real Photoproduction of J/Ψ-Meson Process on Nucleons from
           Experimental Data of Electroproduction on Hydrogen Nuclei, Obtained by
           CLAS12 Setup

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      Abstract: This work describes the methodological part of the analysis on the study of the near-threshold quasi-real photoproduction of vector mesons on nucleons. The analysis uses experimental data obtained at the CLAS12 (Cebaf Large Acceptance Spectrometer) of the CEBAF (Current Beam Accelerator Facility) of the Jefferson Laboratory (USA). The experimental data on the scattering of 10.6 GeV electrons by a liquid hydrogen target is investigated. The work describes methods for the selection and identification of the final states of completely exclusive near-threshold reactions of (Eγ ≥ 8.2 GeV) quasi-real (Q2 ≈ 0) photoproduction of J/ѱ mesons. A step-by-step description of the mechanism for identifying the selection of the final state of a lepton pair and the recoil nucleon is presented. It is shown how the parameters of the distributions of kinematic quantities characteristic of the reactions under study change in the course of the analysis.
      PubDate: 2022-03-01
       
  • Spin-Dependent Multichannel Scattering of Electron in a Quantum Wire with
           a Point Defect

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      Abstract: The tunneling passage of a microparticle with a spin through a three-dimensional delta potential embedded in a quantum wire with a characteristic effect of dimensional quantization is considered. This effect results in multichannel scattering, which does not occur in one-dimensional problems. The particle is also affected by a magnetic field directed along the wire which generally takes unequal constant values on both sides of the barrier. Analytical expressions for the scattering coefficients and the spin polarization coefficient of multichannel scattering are obtained. Several special cases of the obtained formulas are considered. The dependences of the mentioned coefficients on the particle energy, the parameters of the potential barrier and nanotube, and the magnetic field are investigated in a single-channel approximation in detail.
      PubDate: 2022-03-01
       
  • Gas Flowmeter Based on Vibrating Wires

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      Abstract: The paper proposes a new type of gas flowmeters based on measurements of the deformations of the thermal field of the heater in the presence of a flow using vibrating wires. The advantage of such flowmeters as compared with the known ones using a similar thermal principle of operation is the improved accuracy of temperature measurements compared to resistance thermometers or thermocouples. The use of thin wires can also increase the speed of flowmeters. The use of wires 20–30 mm long allows the creation of wide-aperture inlet holes for gas streams. A natural property of the developed flowmeters is also in their bidirectionality. A sample of a flowmeter based on vibrating wires was made and the calibration experiments were carried out. An experiment was carried out in which a flowmeter was used to measure the acceleration.
      PubDate: 2022-03-01
       
  • Magnetic Field Inside a Two-Wire Spiral Line

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      Abstract: A direct current streamlined loop formed by two diametrically opposite spirals of a linear or ribbon wire is a deflector for nonrelativistic electrons and a spiral undulator for relativistic electrons. In this work, analytical expressions are obtained for the three components of magnetic induction inside a two-wire spiral line (TSL), which differ significantly from similar expressions used in scientific works. In particular, in the paraxial region, where electrons interact with the magnetic field, the radial component of the magnetic induction is not an increasing function of the radial coordinate, but a decreasing one. This result is important because the description of the physical characteristics of a free-electron laser or deflector requires taking into account the exact trajectories of the bunch electrons. The obtained correct formulas for the potential of the magnetic field and the components of the magnetic induction are also necessary to determine the values of the resonant frequencies of electromagnetic waves excited by a quasi-stationary sinusoidal voltage inside the TSL.
      PubDate: 2022-03-01
       
  • Rocking Curves of X-Ray Asymmetrical Laue Diffraction in a Crystal with
           the Third-Order Nonlinear Response

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      Abstract: The X-ray Laue asymmetrical diffraction in a perfect crystal with a plane entrance surface is considered taking into account the third-order nonlinear response of a crystal. Using the exact solutions, the rocking curve dependence on the angular departure from the exact Bragg direction and the intensity of the incident wave is investigated. The dependence of rocking curves on the asymmetry degree of diffraction geometry is studied. The obtained results can be used in the preparation of X-ray beams with the given parameters and for object investigations as well.
      PubDate: 2022-03-01
       
  • Test Electron Beams Based on the Linear Accelerator Complex LUE-75 of A.I.
           Alikhanyan National Scientific Laboratory

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      Abstract: Based on the linear electron accelerator LUE-75 of the A.I. Alikhanyan National Scientific Laboratory a technique for obtaining controlled primary electron beams with an intensity of 10–20 electrons per second in the energy range 15–75 MeV for elementary particle detectors calibration was developed and used. Joint work with the V.P. Dzhelepov Laboratory of Nuclear Problems (JINR, Dubna, RF) showed the efficiency of the technique.
      PubDate: 2022-03-01
       
  • Observation of Electroconvection in Nematic Liquid Crystals by X-Ray
           Interferometric Method

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      Abstract: The electroconvection (EC) phenomenon arising in nematic liquid crystals (NLC) of type E7 under the influence of an external electric field was recorded by the method of X-ray interferometry. The character of the refractive indices of the ordinary (no) and extraordinary (ne) waves is studied, and the moment of the appearance of EC in the NLC is determined. It is shown that the phenomenon of electroconvection occurs when no and ne coincide. It is also shown that in the E7 type NLC, where there are no free charge carriers, under the influence of an external electromagnetic field an EC phenomenon can occur as a consequence of the formation of bound charges.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040083
       
  • Spectral Properties of YAP:Yb Laser Crystals with Additional Li+ and Hf4+
           Ions

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      Abstract: In the present work single crystals of yttrium orthoaluminate (YAlO3) activated with Yb3+ ions and additional nonisovalent Li+ and Hf4+ impurities were grown. Comparative measurements of spectral characteristics of crystals including those exposed to gamma-ray irradiation were carried out to reveal the functional role of additional impurities. On the basis of the results obtained, the mechanisms of incorporation and charge compensation mechanisms of Li+ and Hf4+ ions in YAlO3:Yb are considered and the efficiency of using these impurities is shown to obtain crystals with a low concentration of anion vacancies and associated color centers.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040125
       
  • Critical Wavelength in the Metal Waveguide Partially Filled with Nonlinear
           Crystal

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      Abstract: The bandwidth in the system of the nonlinear optical crystal partially filling the cross-section of a rectangular metal waveguide is investigated. Partial filling of a metal waveguide with a nonlinear optical crystal is used to ensure the phase matching for an effective generation of THz radiation in a nonlinear crystal when it is illuminated with the femtosecond optical laser pulse. The critical wavelengths of a metal waveguide with a central symmetric arrangement of crystal plates in the waveguide are numerically calculated depending on the degree of partial filling and the dielectric permittivity of the crystal. It is shown that partial filling of the waveguide with crystal results in an expansion of the bandwidth of the fundamental mode of the odd type Н10, without improving the propagation conditions for the nearest higher even mode Н20, but on the contrary, at a certain degree of filling with the crystal excludes its occurrence.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040113
       
  • Hydrogen Peroxide Semiconductor Sensors

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      Abstract: The results of studies of many types of semiconductor H2O2 sensors are discussed in this review of 185 articles about hydrogen peroxide. The properties of electrochemical detectors, sensors based on organic and inorganic materials, graphene, and nano-sensors are analyzed. Optical and fluorescent sensors, detectors made of porous materials, quantum dots, fibers, and spheres are briefly discussed. The results of our studies in the YSU of hydrogen peroxide sensors made from solid solutions of carbon nanotubes with semiconducting metal oxides are also presented in the review. The fundamentals of the manufacture of biomarkers of respiration containing hydrogen peroxide vapors, which make it possible to judge the degree of a person’s illness with various respiratory diseases (asthma, lung cancer, etc.), are discussed.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040046
       
  • Description of Helix-Coil Transition in Heteropolymers in Frame of GMPC

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      Abstract: The work is devoted to the study of the behavior of heterogeneous biopolymers during the melting of the secondary structure. A random bimodal biopolymer is generated. Each component corresponds to its transfer matrix of GMPC, by multiplying these transfer matrices the free energy of the system is calculated. It is shown that for a length of 5000 repeating units, the reduced free energy does not depend on the realization of the system (primary structure). The corresponding denaturation curves show that the transition point is well defined as a linear combination of the corresponding homopolymers, but the profile of the curves depends on the implementation. The behavior of the number of junctions between the helical and coiled states is calculated. An unexpected result is obtained that the racemic heteropolymer with a length of 5000 repeated units is divided into about 10 sections during the melting process. We associate this with the behavior of correlation in the system, which will be investigated further.
      PubDate: 2021-10-01
      DOI: 10.3103/S106833722104006X
       
  • To the Problem of Description of the Wave Field Radiating by a System of
           Point Coherently Sources

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      Abstract: A consistent approach is developed to the description of a scalar wave field generated by a system of point coherently emitting sources. In particular, the problem of the maxima and minima of the intensity of the superposition field under the conditions of Fraunhofer diffraction is discussed. The problem of determining the serial number of the wave field maxima is investigated. Generalization of the classical result related to interference, when an initial phase shift is present at two sources, is carried out.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040095
       
  • Hard X-Ray Phase-Contrast Laboratory Microscope Based on Three-Block
           Fresnel Zone Plate Interferometer

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      Abstract: A device based on a three-block Fresnel zone plate interferometer is proposed for hard X‑ray phase-contrast imaging. The device combines a low requirement for the coherence of the initial radiation (the interferometer operates in the amplitude division mode) with an optical magnification of the image. A numerical simulation of the image formation is carried out, taking into account the limited source–interferometer distance, the size and spectral width of the X-ray source. The calculations show that the proposed set-up can be used as a phase-contrast microscope using laboratory hard X-ray sources.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040058
       
 
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